1. Select the Shrinker_ps2_psp_CdDvd5_iso.epi on the plugins drop down list.
2. Select the iso you want to rebuild.
3. Click extract LBA.
4. Click extract file and wait for it to finish.
5. Click rebuild file and wait for it to finish.
6. Click rebuild LBA.
7. Burn the new iso with Nero or DVD Decrypter as usual.

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If the first Guide doesn't work and it still didn't Shrink

Try this:

1. Select the Shrinker_ps2_psp_CdDvd5_iso.epi on the plugins drop down list.
2. Select the iso you want to rebuild.
3. Click extract LBA.
4. Click extract file and wait for it to finish.

Now this is where this guide is different from others:
Now find the folder that gnie expert just extracted(should be the files in a folder next to the iso).

Find the boot.pad Or dummie.pad, open with note pad press space bar onces to create sizes.

Now save this in the same folder the boot.pad was in.(boot.pad size should be 1kb instead 0f 2+gb)

5. Click rebuild file and wait for it to finish.
6. Click rebuild LBA.
7. Burn the new iso with Nero or DVD Decrypter as usual.